Last updated on June 3, 2023
Availability Set | Scale Set | |
Description | A group of discrete virtual machines spread across fault domains. | A group of identically configured virtual machines spread across fault domains. |
Workloads | Use Availability Set for predictable workloads. | Use Scale Set for unpredictable workloads (autoscale). |
Domain default | Has 3 fault domains and 5 update domains by default | Has 5 fault domains and 5 update domains by default |
Configuration | Virtual machines are created from different images and configurations. | Virtual machines are created from the same image and configuration. |
Distribution | Virtual machines are automatically distributed within a data center. | Virtual machine scale sets can be distributed within a single datacenter or across multiple data centers. |
Number of VMs | You can only add a virtual machine to the availability set when it is created. | Scale sets can increase the number of virtual machines based on demand. |
Pricing | Availability set has no additional charge. You only pay for the computing resources. | Scale sets have no additional charge. You only pay for the computing resources. |
Sources:
https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/overview
https://docs.microsoft.com/en-us/azure/virtual-machines/availability
https://docs.microsoft.com/en-us/azure/virtual-machines/windows/manage-availability
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